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Commita27f3a7

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Default to wal_sync_method=fdatasync on FreeBSD.
FreeBSD 13 gained O_DSYNC, which would normally cause wal_sync_method tochoose open_datasync as its default value. That may not be a goodchoice for all systems, and performs worse than fdatasync in somescenarios. Let's preserve the existing default behavior for now.Like commit576477e, which did the same for Linux, back-patch to allsupported releases.Discussion:https://postgr.es/m/CA%2BhUKGLsAMXBQrCxCXoW-JsUYmdOL8ALYvaX%3DCrHqWxm-nWbGA%40mail.gmail.com
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‎doc/src/sgml/config.sgml

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Not all of these choices are available on all platforms.
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The default is the first method in the above list that is supported
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by the platform, except that <literal>fdatasync</literal> is the default on
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Linux. The default is not necessarily ideal; it might be
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Linux and FreeBSD. The default is not necessarily ideal; it might be
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necessary to change this setting or other aspects of your system
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configuration in order to create a crash-safe configuration or
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achieve optimal performance.

‎src/backend/utils/misc/postgresql.conf.sample

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#wal_sync_method = fsync# the default is the first option
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# supported by the operating system:
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# open_datasync
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# fdatasync (default on Linux)
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# fdatasync (default on Linux and FreeBSD)
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# fsync
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# fsync_writethrough
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# open_sync

‎src/include/port/freebsd.h

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/* src/include/port/freebsd.h */
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/*
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* Set the default wal_sync_method to fdatasync. xlogdefs.h's normal rules
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* would prefer open_datasync on FreeBSD 13+, but that is not a good choice on
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* many systems.
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*/
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#ifdefHAVE_FDATASYNC
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#definePLATFORM_DEFAULT_SYNC_METHODSYNC_METHOD_FDATASYNC
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#endif

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